I'm not trying to swindle anyone! I told him that he's late to dance! But he still thinks he can make something work! So I ask if anyone has a solution … if you can not help, then, please do not have to judge or answer here!
The people who have told you that this will not work already have a solution, to be honest with the client.
If you are genuine in not trying to steal, investigate as much as possible and then present the facts to your client.
The only viable way to make money with bitcoin mining today is to have lower entry costs than the rest of the network. For that to work, you need to have electricity for free. In any case, you are only burning your money by investing in useless hardware that will have a perpetual loss and has no recycling / reuse value.